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A dip in the UHECR spectrum and the transition from galactic to extragalactic cosmic rays
R. Aloisio, V. Berezinsky, P. Blasi +3
The dip is a feature in the diffuse spectrum of ultra-high energy (UHE) protons caused by electron-positron pair production on the cosmic microwave background (CMB) radiation. For…
Anomalous Fluctuations in Observations of Q0957+561 A,B: Smoking Gun of a Cosmic String?
R. Schild, I Masnyak, B. Hnatyk +1
We report the detection of anomalous brightness fluctuations in the multiple image Q0957+561 A,B gravitational lens system, and consider whether such anomalies have a plausible int…
Superconducting cosmic strings as gamma ray burst engines
V. Berezinsky, B. Hnatyk, A. Vilenkin
Cusps of superconducting strings can serve as GRB engines. A powerful beamed pulse of electromagnetic radiation from a cusp produces a jet of accelerated particles, whose propagati…
Supernova remnants as cosmic ray accelerators. SNR IC 443
B. Hnatyk, O. Petruk
We examine the hypothesis that some supernova remnants (SNRs) may be responsible for some unidentified gamma-ray sources detected by EGRET instrument aboard the Compton Gamma Ray O…